<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下拉菜单</title>
</head>
<body>

城市：
<select>
    <option>北京</option>
    <option selected>上海</option>
    <option>深圳</option>
    <option>广州</option>
</select>
</body>
</html>